BASIC PARAMETERS:Range:0.1 Module to 40 Module and 64 DP to 0.5 DPStart: Single or Multi StartAccuracy: A, B & C (as per DIN 3968, BS 2062)Forms : Non-Topping, Semi-Topping, Topping, finishing, pre-shaving, pre- grinding, with or without protuberance, full fillet etc.Material : M-2,M35, ASP 30 etc.Chain Sprocket Hobs are usually supplied in un ground form to cut roller chain sprockets to din, American standard with the range from 1/4" to 3" pitch or 5mm to 76.2 mm pitch.